Files and folders are far from old tech. It is like not knowing how to calculate 2+2.
Where do you see files and folders nowadays? They're pretty much only used by developers and some corporate offices.
They are used by literally every office worker who does their job on a computer. It's not remotely uncommon.
Google drive, icloud drive, anything drive is also file/folders based. Someone that doesn't know about that is a modern-day illiterate. Yeah, I know, there are many of them nowadays.
Are they actually? Google Drive has folders, but there's no concept of things like "which folder is this file in", you can have access to many root folders but not a list of them all, and the most convenient way to find anything is to search.
They are still present everywhere. They are just badly hidden behind a leaky abstraction.